A certain indicator HA has a Ka value of 000040 The protonat

A certain indicator, HA, has a Ka value of 0.00040. The protonated form of the indicator is blue and the ionized form is red. What is the pKa of the indicator? Number pK. = | | 3.397 What is the color of this indicator in a solution with pH 1? O purple O red O blue

Solution

In order to show colour change by an indicator the pH must be in the range between (pKa+1) to (pKa-1) .otherwise the indicator dont show ant colour change .

in this given problem the pH is not in between the required range . so colour change not happen . so the colour of the indicator in a solution with pH=1 is purple.